Math reference, not dosing recommendation. The dose ranges here are pulled from public protocols and the matching Protocol One dosing page for each peptide. Talk to your prescriber before injecting anything. The calculator does not check your prescription; it only runs the math you ask it to.
Reference matches the dosing page for each peptide. Custom lets you enter any vial.
Pre-dissolved vial: compounded GLP-1s ship already in solution at a stated mg/mL concentration. No bacteriostatic water needed - skip the water step and enter the concentration directly.
Saved calculations
FAQ
What is bacteriostatic water?
Sterile water with 0.9% benzyl alcohol added as a preservative. Lets a reconstituted vial stay stable in the fridge for ~30 days vs ~24 hours for plain sterile water. Sold over-the-counter at most US pharmacies in 30mL vials; compounding pharmacies sell it too.
What's the difference between mcg and mg?
1 mg = 1,000 mcg. Most research peptides are dosed in mcg (250mcg, 500mcg, etc) because the working amounts are small. Compounded GLP-1s like tirzepatide and semaglutide are dosed in mg (2.5mg, 5mg). Use the unit toggle to switch.
Why does my syringe show "units" instead of mL?
Insulin syringes are marked in units because they were designed for insulin dosing where every drop matters. 100 units = 1 mL on a standard 1mL insulin syringe. The calculator converts mL into units for whichever syringe you pick.
Is the calculator the same as a prescription?
No. The calculator runs math on numbers you enter. It does not check your prescription, your medical history, or whether the dose you entered is appropriate for you. Talk to your prescriber. The preset doses match the protocols on the matching Protocol One dosing page, which is editorial reference, not medical advice.
Can I share my calculation?
Yes. The URL updates as you change inputs. Copy the URL and the next person who opens it sees the same setup. Use the "Copy share link" button if you want a clean Reddit / X / SMS-ready snippet of the math.
Where do the preset dose ranges come from?
Each preset is pulled from the matching Protocol One dosing page (linked from the result panel). Those pages cite primary clinical literature where available, our peptide cheat sheet audit, and the editorial verdict on what most US compounding pharmacies actually dispense. The sanity-check upper bound is set above the typical max so power-user protocols don't flag, but well below doses with no evidence base.
More from Protocol One: